Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Artiodactyla Owen, 1848 - even-toed ungulates see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
       Family Suidae Gray, 1821 - pigs
         Genus Babyrousa Perry, 1811 - babirusa
           1 Babyrousa babyrussa (C. Linnaeus, 1758) - babirusa
           2 Babyrousa bolabatuensis Hoojer, 1950
           3 Babyrousa celebensis (Deninger, 1909)
           4 Babyrousa togeanensis (Sody, 1949)